////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2011-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <string>

#include <QDateTime>
#include <QString>

#include "news-reader.h"
#include "octave-qobject.h"
#include "gui-preferences-nr.h"

#include "url-transfer.h"
#include "version.h"

namespace octave
{
  void news_reader::process (void)
  {
    QString html_text;

    if (m_connect_to_web)
      {
        // Run this part in a separate thread so Octave can continue to
        // run while we wait for the page to load.  Then emit the signal
        // to display it when we have the page contents.

        QString url = m_base_url + '/' + m_page;
        std::ostringstream buf;
        url_transfer octave_dot_org (url.toStdString (), buf);

        if (octave_dot_org.is_valid ())
          {
            Array<std::string> param;
            octave_dot_org.http_get (param);

            if (octave_dot_org.good ())
              html_text = QString::fromStdString (buf.str ());
          }

        if (html_text.contains ("this-is-the-gnu-octave-community-news-page"))
          {
            if (m_serial >= 0)
              {
                resource_manager& rmgr = m_octave_qobj.get_resource_manager ();
                gui_settings *settings = rmgr.get_settings ();

                if (settings)
                  {
                    settings->setValue (nr_last_time.key,
                                        QDateTime::currentDateTime ());

                    settings->sync ();
                  }

                QString tag ("community-news-page-serial=");

                int b = html_text.indexOf (tag);

                if (b)
                  {
                    b += tag.length ();

                    int e = html_text.indexOf ("\n", b);

                    QString tmp = html_text.mid (b, e-b);

                    int curr_page_serial = tmp.toInt ();

                    if (curr_page_serial > m_serial)
                      {
                        if (settings)
                          {
                            settings->setValue (nr_last_news.key,
                                                curr_page_serial);

                            settings->sync ();
                          }
                      }
                    else
                      return;
                  }
                else
                  return;
              }
          }
        else
          html_text = QString
            (tr ("<html>\n"
                 "<body>\n"
                 "<p>\n"
                 "Octave's community news source seems to be unavailable.\n"
                 "</p>\n"
                 "<p>\n"
                 "For the latest news, please check\n"
                 "<a href=\"https://octave.org/community-news.html\">https://octave.org/community-news.html</a>\n"
                 "when you have a connection to the web (link opens in an external browser).\n"
                 "</p>\n"
                 "<p>\n"
                 "<small><em>&mdash; The Octave Developers, ") + OCTAVE_RELEASE_DATE + "</em></small>\n"
             "</p>\n"
             "</body>\n"
             "</html>\n");
      }
    else
      html_text = QString
        (tr ("<html>\n"
             "<body>\n"
             "<p>\n"
             "Connecting to the web to display the latest Octave Community news has been disabled.\n"
             "</p>\n"
             "<p>\n"
             "For the latest news, please check\n"
             "<a href=\"https://octave.org/community-news.html\">https://octave.org/community-news.html</a>\n"
             "when you have a connection to the web (link opens in an external browser)\n"
             "or enable web connections for news in Octave's network settings dialog.\n"
             "</p>\n"
             "<p>\n"
             "<small><em>&mdash; The Octave Developers, ") + OCTAVE_RELEASE_DATE + "</em></small>\n"
         "</p>\n"
         "</body>\n"
         "</html>\n");

    emit display_news_signal (html_text);

    emit finished ();
  }
}
